Cooling device



FIG. 1 is a perspective view of a cooling device showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof, the right side being a mirror image; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a cooling device, as shown and described. 